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Book Chapter

The Indefatigable Field, Blocks 49/18, 49/19, 49/23, 49/24, UK North Sea

By
C. W. McCrone
C. W. McCrone
Present address: BP Exploration, Chertsey Road, Sunbury on Thames, Middlesex TW16 7LN, UK
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M. Gainski
M. Gainski
BP Amoco Exploration, Dyce, Aberdeen AB21 7PB, UK
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P. J. Lumsden
P. J. Lumsden
BP Amoco Exploration, Dyce, Aberdeen AB21 7PB, UK
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Published:
January 01, 2003

Abstract

Indefatigable is a mature dry gas field on the northeastern margin of the UK Southern North Sea Rotliegend Play fairway. The field was discovered, 49/18-1, by the Amoco operated group in 1966 and subsequent appraisal drilling established that the field extended over four blocks (i.e. 49/18, 49/19, 49/23 & 49/24). There have been several phases of development, initial production concentrated on the main horst block with first gas in 1971, followed by the west flank area in 1977/78. Then in 1987/88 the SW and SE Indefatigable satellite accumulations were brought on-stream.

The Rotliegend Leman Sandstone Formation reservoir primarily consists of stacked aeolian dune sandstones (150—400 ft) of good reservoir quality (porosity 15%, permeability 100-1000 mD). However, the integration of the 1992/93 3D seismic survey, well data, reservoir pressure and production data has lead to a much more complex view of the field with 11 gas-water contacts and 15 reservoir compartments.

This has resulted in an upward revision of the gas initially-in-place from 5.2 to 5.6 TCF and recoverable reserves from 4.4 to 4.7 TCF. Current work is focused on maximizing recovery from the various reservoir compartments and accessing this additional potential.

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Contents

Geological Society, London, Memoirs

United Kingdom Oil and Gas Fields Commemorative Millennium Volume

J. G. Gluyas
J. G. Gluyas
Acorn Oil Gas Ltd, Staines, Middlesex, UK
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H. M. Hichens
H. M. Hichens
Oil and Gas Directorate, London, UK
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Geological Society of London
Volume
20
ISBN electronic:
9781862393950
Publication date:
January 01, 2003

GeoRef

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